385 citations · 3.7k across the 95 of their papers we have counts for
7 papers · 1 filter
Atomic Form Factors and Inverse Primakoff Scattering of Axion
Tomohiro Abe, Koichi Hamaguchi, Natsumi Nagata
We reexamine the inverse Primakoff scattering of axions, whose scattering cross section depends on the distribution of electrons in target atoms. We evaluate it using a form factor…
Low-Energy Probes of No-Scale SU(5) Super-GUTs
John Ellis, Jason L. Evans, Natsumi Nagata +2
We explore the possible values of the branching ratio, , and the electron dipole moment (eEDM), , in no-scale SU(5) super-GUT models wit…
Building Models of Inflation in No-Scale Supergravity
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +3
After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity. W…
R-Symmetric Flipped SU(5)
Koichi Hamaguchi, Shihwen Hor, Natsumi Nagata
We construct a supersymmetric flipped SU(5) grand unified model that possesses an symmetry. This symmetry forbids dangerous non-renormalizable operators suppressed by a cut…
Supernova-scope for the Direct Search of Supernova Axions
Shao-Feng Ge, Koichi Hamaguchi, Koichi Ichimura +5
If a supernova explosion occurs within a few hundred parsecs from the Earth, a huge number of axions, in addition to neutrinos, may arrive at the Earth. In this paper, we discuss i…
Leptogenesis in the minimal gauged U(1) model and the sign of the cosmological baryon asymmetry
Kento Asai, Koichi Hamaguchi, Natsumi Nagata +1
The minimal gauged U(1) model is a simple extension of the Standard Model and has a strong predictive power for the neutrino sector. In particular, the mass spectrum an…